A small South American dog, domesticated by the natives, now thought to be extinct.
1803, John Browne Cutting, “A Succinct History of Jamaica” in Robert Charles Dallas, The History of the Maroons, London: Longman and Rees, Volume 1, pp. lxxviii-lxxix,
[…] the alco, a mute little dog, caressing and sequacious, once loved and cherished by its poor Indian masters, is like them exterminated.